黑钨矿有效沉淀机制:CO_2逃逸
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  • 英文篇名:THE EFFICIENT MECHANISMS FOR PRECIPITATING WOLFRAMITE: CO_2 ESCAPING
  • 作者:刘向冲 ; 张德会
  • 英文作者:LIU Xiangchong;ZHANG Dehui;Institute of Geomechanics,Chinese Academy of Geological Sciences;The Laboratory of Dynamic Digenesis and Metallogenesis,Institute of Geomechanics,CAGS;School of Earth Sciences and Resources,China University of Geosciences (Beijing);
  • 关键词:黑钨矿 ; 沉淀机制 ; CO2逃逸 ; 平衡反应模型
  • 英文关键词:wolframite;;precipitation mechanism;;CO2 escaping;;equilibrium reaction modeling
  • 中文刊名:DZLX
  • 英文刊名:Journal of Geomechanics
  • 机构:中国地质科学院地质力学研究所;中国地质科学院地质力学研究所动力成岩成矿实验室;中国地质大学(北京)地球科学与资源学院;
  • 出版日期:2019-02-15
  • 出版单位:地质力学学报
  • 年:2019
  • 期:v.25
  • 基金:中国地质科学院基本科研业务费(JYYWF20180602,DZLXJK201603);; 国家自然科学基金(41602088,41402295)
  • 语种:中文;
  • 页:DZLX201901008
  • 页数:8
  • CN:01
  • ISSN:11-3672/P
  • 分类号:25-32
摘要
黑钨矿是石英脉钨矿床的主要矿石矿物,其沉淀机制一直存在争议。CO_2逃逸能否造成黑钨矿有效沉淀尚缺乏定量模型的评价。文章建立了W-Fe-Cl-Na-O-C-H体系的反应平衡模型,涉及22种组分和16个化学反应;相关热力学参数来自SUPCRT数据库。模型计算结果表明,pH与流体压力呈负相关关系,而钨溶解度与流体压力呈正相关关系;当成矿流体压力从静岩压力降至静水压力水平,钨溶解度降幅可达到27%~47%,降幅与温度和深度成正比。因而,降压造成的CO_2逃逸是黑钨矿沉淀的有效机制之一。
        Wolframite is the main ore mineral of vein-type tungsten deposits. How wolframite precipitates from hydrothermal fluids is highly disputed in the literature. Whether CO_2 escaping causes significant precipitationof wolframitehas not been quantitatively examined. A reaction equilibrium model for the system of W-Fe-Na-Cl-H-C-O was established in this contribution. The model contains 22 species and 16 reactions,the thermodynamic data of which are from the database SUPCRT. The modeling results indicate that pH is negatively correlated to fluid pressure and tungsten solubility is positively correlated to fluid pressure. A decreasein fluid pressure from lithostatic to hydrostatic level could cause a drop of tungsten solubility by 27% ~ 47%,and the decrease degree has a positive correlation to temperature and depth.Therefore,CO_2 escaping accompanying a drop of fluid pressure is one of the mechanisms precipitating wolframite efficiently.
引文
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